What does the 215/50r17 tire mean?

[MelanieFitz]

Automotive tire specification 215/50r17 refers to a tread width of 215mm; 50 is the aspect ratio (tire height ÷ tread width) indicating 50%; r denotes that the tire has a radial structure with steel belts; 17 indicates the rim diameter is 17 inches. When using tires, pay attention to the following points: 1. Develop the habit of regularly checking tire pressure: Pressure is key to extending tire lifespan—frequently exceeding normal pressure by 20% reduces tire life by 10%; if frequently below normal pressure by 30%, tire life decreases by 52%. 2. Maintain consistent tire pressure: Tire pressure is the lifeblood of tires. Low pressure increases tire body deformation, leading to sidewall cracks, excessive heat generation, rubber aging, ply fatigue, and cord breakage. 3. Regularly remove foreign objects from tires: While driving, small stones often get lodged in the tread grooves. If not promptly removed, these stones can puncture the tire over time, causing leaks or blowouts.